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2AM is a South Korean four-member ballad boy band under JYP Entertainment. The members are Jinwoon, Jokwon (the leader), Seulong, and Changmin. 2AM is one of the two subgroups branched out from the eleven-member (before Jaebeom's departure) boy band One Day, the other being 2PM. They officially debuted on July 11, 2008 on KBS's Music Bank, performing their debut song "이 노래" (This Song). They won their first Mutizen at Inkigayo on February 7, 2010 with "죽어도 못 보내" ("Can't Let You Go Even If I Die") .

The leader of the group, Jokwon is the longest-serving trainee in JYP Entertainment, having trained for 2567 days. He was chosen as last members of Park Jin Young's 99% Challenge project along with Sunye of Wonder Girls

He sang with Jinwoon in May Doni's "몰라-ing"(Molla-ing) and featured in W&Whale's song and music video "덩크슛" (Dunk Shoot). He was part of "Dirty Eyed Girls" on an episode of 2PM's reality show "Wild Bunny", performing a parody of popular Brown Eyed Girls song Abracadabra. The music video became extremely popular.

In September 2009, Jokwon was one of the main MCs for SBS's environmental variety show "Find it! Green Gold" with Super Junior member Shindong, SS501 member Kim Hyung Joon, and former Fly To The Sky member Brian Joo. He also replaced 2PM's Jaebeom on historical culture variety show Nodaji after his internet controversy. The other hosts included Kim Jae Dong, Jo Hye Ryun, Shin Jung Hwan, Hwang Bo and Nicole from Kara. He joined the cast of We Got Married on October 3, 2009, coupled up with Brown Eyed Girls member Ga-in. Although they were initially only supposed to feature for the Chuseok special, their appearance brought in the highest ratings yet for Season II, and they were announced a permanent couple.

Jokwon was diagnosed with H1N1 on October 28, 2009, causing him to postpone filming We Got Married. The next day, a representative stated that Jokwon was recovering quickly after treatment.

He released a digital single "우리 사랑하게 됐어요" ("We Fell in Love") on December 16, 2009, a duet with his We Got Married partner Ga-in., which topped variety online music charts, winning 2 mutizens on Music Bank's K-Charts and the "Background phone music" award at the Gaon Charts.

Changmin was born in Tenafly, New Jersey. Changmin has finished his mandatory army service, the only idol to have entered the entertainment scene with a completed army service. In December 12, 2008, he featured in Mario's digital single "Superman". He and Jokwon released a digital single titled "졸업" ("Graduation") on February 5, 2009. He was absent from OneDay's predebut reality show "Hot Blood" because of having joined JYP after it was filmed. In December 2009, he contributed to the original soundtrack of drama series "돌멩이의 꿈" (" A Dream Comes True") with a solo single "삼키지마" ("Don't Swallow").

He is currently a DJ for "Starry Night Radio" with Girls' Generation's Sooyoung.

He was part of "Dirty Eyed Girls" on an episode of 2PM's reality show "Wild Bunny", performing a parody of popular Brown Eyed Girls song Abracadabra with Jokwon. The music video became extremely popular. Seulong and Jinwoon make regular appearances as commentators for We Got Married Season II.

He starred in 8eight's music video "잘가요 내사랑" ("Goodbye My Love") with Kim So Eun and Jung Gyeo-Woon, as well as singing in May Doni's song "몰라-ing" ("Don't Know-ing") with Jokwon on January 15, 2009. Seulong and Jinwoon make regular appearances as commentators for We Got Married Season II.

Jinwoon was diagnosed with an early case of H1N1, but recovered quickly before the illness took effect. He became part of "아이돌 막내반란시대" (Idol Maknae Rebellion) along with the other youngest members of fellow idol groups FT Island, U-Kiss, T-Max, Mighty Mouth and later MBLAQ. The first episode aired on November 7, 2009.